Elevator



(No Model.)

H. D. '0; KURRUS.

Elfevator..

FatentedJune 14,1881..

RMX f ATTORNEYS.

HA PETERS. Pnmberwgmgnef. wzmmgwn, c C.

UNITED STATES PATENT OFFICE.

HENRY D. O. KURRUS, OF BOSTON, MASSACHUSETTS.

ELEvATo R.

SPECIFICATION forming part of Letters Patent No. 242,940, dated June 14, 1881'.

Application filed November 2, 1880. (No model.)

To all whom yt may concern: i

Be it known that I, HENRY D. O. KURRUs,

of Boston, in the county of Suffolk and State oflllassachusetts, have invented a new and Improved Elevator, of which the following is a specification.

The object of this invention is so to construct a passenger-elevator that the cage cannot by any accident fall nor be elevated above a fixed point, and will automatically adjust itself to any inclination of the building occasioned by settling, warping, or shrinking.

Figure l is a front elevation of the device. Fig. 2 is a sectional side elevation on line x, Fig. l. Fig. 3 is a transverse section on line y y, Fig. l. Fig. 4 is an enlarged vertical section on line w w, Fig. 5. Fig. 5 is au enlarged vertical elevation on line z z, Fig. 4.

Similar letters of reference indicate corresponding parts.

In the drawings, A A represent the vertical side casing or walls of the elevator-well, and B a suitable cross frame or` tilnher for supporting the vertical driving-shaft G and its horizontal cog-wheel C', through which power is Y transmitted for operating the elevator.

Secured on opposite sides of thecasing A, at the top and bottom of the well, are journalboxes D, that hold the upper and lower ends of the screws E, while intermediate boxes, D', for holding the central portions of the screws E,.are also secured to the casing A, as shown. When of any considerable length-the screws E E are preferably constructed, as shown, in sections, whose connecting ends are turned down, as shown at a, so as to present a small bearingon the journal-boxes D', and are scarfed together and fastened by a bolt, a', as shown in Figs. 4 and 5 5 or when the said screws E E are not made in sections they are reduced at their bearings, to permit the use of suitable boxes, D', that shall not interfere with the operation of the elevator.

The journal boxes D', that embrace the screws E E at their reduced bearings, are constructed with a thin front, I), that they may not extend outward beyond the bottoms of the threads of the screws E E, and thereby interfere with the movements of the clamps or nuts H. It will be seen, then, that the screws E E project to the depth of their threads beyond the faces of the boxes D'.

To facilitate the putting together or taking apart of the sectional screws E an opening, c, is made through the front of each intermediate box, D', for the insertion or withdrawal ofthe bolt or screw a'. The sides of the said boxes D' are projected forward, as shown at d d, thereby forming, in combination with the guides F F, vertical sockets for the free up and down movements of the clamps or screw-threaded nuts H, that hold the sections G of the car or cage frame G G in position. A guide,-,F, consists of a pair of narrow flat -plates secured Vparallel with each other, with a narrow space between them, on the forward projections of the boxes D D', by bolts or screws f f, a guide,

- F, being thus secured in front of and a short distance from each screw E.

The two sections G of the cage-frame consist of stout plates of metal, with ends bent inward at right angles, forming arms that are provided with vertical sockets g g, in which are journaled on suitable pins sheaves G" G', whose peripheries extend beyond the faces of lsaid plates, for the purpose of holding the car or cage I more securely. yThe lower arms ot' these sections G arevpreferably longer than the upper arms thereof, as they have to support the car or cage I, and they are preferably provided with two sheaves, G', each, for the better security of said car or cage I, and to enable said car or cage I to more readily adjust itself should the screws E E deviate from the perpendicular. These sections G G form, essentially, a rectangular band for embracing the car or cage I, and said sections G G are held perpendicularly against opposite guides, F, by two flanged screw nuts or clamps, H H, that are set against the reverse faces of the guides F, and are firmly united to the said sections G by bolts or screw hh, that pass between IOO are secured rails m m, that it into the grooves of the sheaves G G', so that said cage or car I may, when required, have easy lateral motion.

Centrally on the sides of the cage or car I are secured springs M, that press constantly against the frame-sections G G, and thereby operate to keep the attached clamps or nuts H H securely in contact with screws E E, and at the same time serveto hold said cage or car I centrally within the frame G G, and to relieve the wear ou the guide-rails F F.

On the lower extremities of the screws E E are fixed the pinions L L, that mesh with the driving cog-wheel U'. Power applied to the shaft U revolves the wheel G', and thereby the screws E E, the threads ot' which, engaging iu the nuts or clamps H H, are simultaneously operated and move the car or cage I and its containing-frame G G up or down, according to the direction in which said screws E E may be turned.

In order to prevent an extreme elevation of the car or cage I, that might otherwise occur from disarrangement of the hoisting mechanism or negligence of the engineer or operator, the screws E E are deprived of their threads for a space at their upper ends, as shown at m', and also leaving a short interval, o, of threads at lower points, n fn, so that when, in the upward movement of the car or cage I, the bottoms of the upper nuts or clamps H H have reached the upper extremity of the screwthreads at o, the bottoms of the lower nuts or clamps H H have reached the top of the continuous threads of the said screws E E, and hence, because of the absence of threads at m' n, the screws E E cease to move the said car or cage I any higher, while the car or cage I remains secure, because ot' the gearing ot' the clamps or nuts H H in the screws E E.

To provide against too extreme a descent of the cage or car l, a shifting-bar, N, or other convenient device, may be so arranged that the said cage or car I shall, in descending, come in contact with it, and thereby throw off the driving-belt or stop the driving machinery.

Forordinary passen ger-elevators the screws E E are designed to be from two and one-half to four inches, or thereabout, in diameter, and to have square threads, while for merchandise or baggage elevators they may be made of any diameter most suitable for the Work.

This device is simple of construction, exceedin gly strong and durable, and is absolutely a safety-elevator,77 and as such is far superior to the elevators in common use.

Having thus fully described my invention, I claim'as new and desire to secure by Letters Patent- 1. In an elevator, the combination of the perpen dicular screws E, having unthreaded spaces m n, the guides F, the car-frame G, the nuts H, and the cage I, all arranged substantially as shown and described.

2. In an elevator, the combination, with the elevating-screwsE E, having reduced intermediate bearings, a., of the boxes D,provided with narrow fronts b, constructed substantially as herein shown, and forthe purpose described.

3. The combination, with the frame-sections G G, provided with sockets g g, of revolving sheaves G G', substantially as herein shown and described, whereby the cage or car I is supported and held in place, as set forth.

4. In an elevator, the combination, with the frame G G, provided with sockets g g and sheaves G G',ot' the car or cage I, provided with rails m m and springs M, substantially as and for the purpose described.

5. The combination, with the screws E E, provided with pinions L L, of the horizontal wheel U', substantially as herein shown and described, whereby both screws are operated simultaneously, as set forth.

HENRY D. O. KURRUS.

Witnesses:

HENRIETTE K. WHITE, WILLIAM H. ORcUcrT. 

